PHP user management and billing customization

PHP expert ONLY I need someone who is knowlegeable in PHP + SMARTY that who can customize and integrate some readily made available opensource project Project requirements Modify [login to view URL] project (current) be a 3-level user and billing management on one set of PHP pages OR have 3 different set of php pages for each user (Admin, reseller, users) http://domain/manager <<<<<<< for reseller pages http://domain/admin <<<<<<< for the admin pages http://domain/users <<<<<<< for clients/users What meant by 3-level user management? e.g. Reseller A should be able to add,edit,modify all users under his reseller_id. Reseller B should be be able to browse, select edit , modify, bill user from Reseller A.. and vice versa. ADMIN can do everything USERS can only , change their profile setting, personal info, change password. Will be needing additional sets of web pages for the logins on each user for security. [login to view URL] [login to view URL] must have a PAYPAL account